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Table 3 Results of conditional logit and mixed logit analysis

From: Identifying the primary outcome for a randomised controlled trial in rheumatoid arthritis: the role of a discrete choice experiment

Variable (name used in the model) Conditional logit model Mixed logit model
Coefficient (SE) Coefficient (SE)
My feet are somewhat painful when I walk (pain_1) 0.389 (0.069)*** 0.474 (0.082)***
My feet are not painful when I walk (pain_2) 0.44 (0.069)*** 0.536 (0.12)***
I have some problems with mobility (mobility_1) 0.350 (0.069)*** 0.443 (0.079)***
I have no problems with mobility (mobility_2) 0.176 (0.069)* 0.139 (0.117)
I have some problems with doing everyday activities (daily_activities_1) 0.195 (0.069)** 0.264 (0.08)***
I have no problems with doing everyday activities (daily_activities_2) 0.27 (0.068)*** 0.396 (0.098)***
I usually feel moderately tired after walking (fatigue_1) 0.167 (0.069)* 0.235 (0.079)**
I usually do not feel tired after walking (fatigue_2) 0.045 (0.068) 0.052 (0.081)
My walking ability is moderately affected by the footwear I choose (shoes_1) 0.161 (0.069)* 0.223 (0.079)**
My walking ability is not affected by the footwear I choose (shoes_2) 0.104 (0.069) 0.129 (0.092)
To improve my walking, I will go for supervised exercise as part of a group twice a week for 6 weeks (health_fitness_1) −0.027 (0.085) −0.057 (0.102)
To improve my walking, I will go for one-to-one supervised exercise, once a week for 12 weeks (health_fitness_2) 0.124 (0.084) 0.149 (0.099)
To improve my walking, I will go for one-to-one supervised exercise, twice a week for 6 weeks (health_fitness_3) 0.131 (0.084) 0.173 (0.097)
Standard deviations
 pain_1   −0.231 (0.147)
 pain_2   0.989 (0.121)***
 mobility_1   0.003 (0.196)
 mobility_2   0.924 (0.119)***
 daily_activities_1   0.123 (0.136)
 daily_activities_2   0.626 (0.11)***
 fatigue_1   0.004 (0.138)
 fatigue_2   −0.198 (0.141)
 shoes_1   0.043 (0.098)
 shoes_2   −0.481 (0.098)***
 health_fitness_1   0.314 (0.158)*
 health_fitness_2   −0.23 (0.194)
 health_fitness_3   −0.010 (0.174)
Number of observations 3600 3600
chi-squared 108.661 119.858
Model degrees of freedom 13 13
  1. * p < 0.05, ** p < 0.01, *** p < 0.001
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